The KM 4-40 features 4 independent heating zones and a total heating area of 40 Sq. Ft. The expanded heating size combined with the versatility and ease of use make the KM 4-40 KM’s most popular infrared unit among asphalt contractors. The KM 4-40 is a self-trailering unit making it extremely easy to transport from jobsite to jobsite. Although larger, the KM 4-40 is mounted on 4 casters making it just as maneuverable as smaller infrared units while still giving you the ability to seamlessly repair any asphalt defects you come up against.